I didn't find an emphatic, crystal clear proven answer to that question.
My IMPRESSION from reading a lot of sites about underseas volcanoes was that there's a lot more going on than anyone suspected. And, it appears that many have lighted off relatively recently. Certainly not paying attention to a phenomenon we didn't know existed would color the stats.
If you find a b etter answer to your question, please ping me.
It appears that there's no basis whatsoever to claim an increase in activity. Given that, you would do well not to expose yourself to the inevitable jeering that comes with making that suggestion.
Keep in mind that throughout human history, there have always been people who claim the world is about to come to an end. Their batting average is zero. Unless there's a very solid answer to the question of why this case might be different, it's good to remember that the world still exists despite legions who have claimed it would not.